December weather forecast
Putnam, IL

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Weather in December

December, the first month of the winter in Putnam, is still a cold month, with an average temperature ranging between min 25.3°F (-3.7°C) and max 35.6°F (2°C).

Temperature

A moderate decline in the average high-temperature is seen during December, decreasing from a chilly 47.3°F (8.5°C) in November to an icy 35.6°F (2°C). Putnam experiences a steady low-temperature of 25.3°F (-3.7°C) throughout December.

Humidity

The average relative humidity in December is 81%.

Rainfall

The months with the least rainfall are January and December Rain falls for 7.5 days and accumulates 1.57" (40mm) of rain.

Snowfall

Months with snowfall in Putnam are January through April, October through December. In December, it is snowing for 7 days. Throughout December, 2.28" (58mm) of snow is accumulated. In Putnam, during the entire year, snow falls for 36.7 days and aggregates up to 14.09" (358mm) of snow.

Daylight

December has the shortest days of the year in Putnam, with an average of 9h and 18min of daylight.
On the first day of the month, sunrise is at 7:04 am and sunset at 4:29 pm. On the last day of December, sunrise is at 7:22 am and sunset at 4:38 pm CST.

Sunshine

In December, the average sunshine is 4.2h.

UV index

The average daily maximum UV index in December in Putnam is 2. A UV Index value of 2, and less, symbolizes a low threat to health from unsafe exposure to UV radiation for the ordinary person.
Note: A daily high UV index of 2 in December leads to these guidelines:
Protection from prolonged sun exposure is necessary for babies, children, and individuals with sensitive skin. Minimize direct exposure to the Sun during midday when its radiation is at its peak. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Guard yourself! Snow reflection can almost double the UV radiation from the Sun.
Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is it in Putnam in December?

In Putnam, in December, the average high-temperature is 35.6°F (2°C), and the average low-temperature is 25.3°F (-3.7°C). The average heat index (a.k.a. 'feels like', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, in July is estimated at 87.8°F (31°C).

What is the average humidity in December in Putnam?

In Putnam, Illinois, the average relative humidity in December is 81%.

What is the driest month in Putnam?

January and December are months with the least rain when the rain falls for 7.5 days and typically aggregates up to 1.57" (40mm) of rain.

How much does it rain in Putnam in December?

In Putnam, in December, during 7.5 rainfall days, 1.57" (40mm) of precipitation is typically accumulated.

How much does it snow in Putnam in December?

In December, in Putnam, Illinois, it is snowing for 7 days. Throughout December, 2.28" (58mm) of snow is accumulated.

What is the month with the shortest days in Putnam?

The month with the shortest days is December, with an average of 9h and 18min of daylight.

What is the average length of the day in December in Putnam?

In December, the average day length in Putnam is 9h and 16min.

When are sunrise and sunset in December in Putnam?

In December, on the first day of the month, sunrise is at 7:04 am and sunset at 4:29 pm. On the last day of the month, in Putnam, sunrise is at 7:22 am and sunset at 4:38 pm CST.

How many hours of sunshine does Putnam have in December?

In December, the average sunshine duration is 4.2h.

How high is the UV index in December in Putnam?

The average daily maximum UV index in December in Putnam is 2. A UV Index of 2, and less, symbolizes a minimal hazard to health from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Putnam, IL

Average temperature in December - Putnam, IL
  • Average high temperature in December: 35.6°F

The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (29.3°F).

  • Average low temperature in December: 25.3°F

The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (17.4°F).

Average pressure in December
Putnam, IL

Average pressure in December - Putnam, IL
  • Average pressure in December: 30.11"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

Average wind speed in December
Putnam, IL

Average wind speed in December - Putnam, IL
  • Average wind speed in December: 9.7mph

The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).

Average humidity in December
Putnam, IL

Average humidity in December - Putnam, IL
  • Average humidity in December: 81%

The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (72%).

Average rainfall in December
Putnam, IL

Average rainfall in December - Putnam, IL
  • Average rainfall in December: 1.57"

The wettest month (with the highest rainfall) is May (4.41").
The driest months (with the least rainfall) are January and December (1.57").

Average rainfall days in December
Putnam, IL

Average rainfall days in December - Putnam, IL
  • Average rainfall days in December: 7.5 days

The month with the highest number of rainy days is May (18.4 days).
The month with the least rainy days is February (5.9 days).

Average snowfall in December
Putnam, IL

Average snowfall in December - Putnam, IL
  • Average snowfall in December: 2.28"

The month with the highest snowfall is February (3.7").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in December
Putnam, IL

Average snowfall days in December - Putnam, IL
  • Average snowfall days in December: 7 days

The month with the highest number of snowfall days is January (11.2 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Putnam, IL

Average daylight in December / Average sunshine in December - Putnam, IL
  • Average daylight in December: 9h and 2min

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in December: 4h and 1min

The month with the most sunshine is June (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).

Average sunshine days in December
Putnam, IL

Average sunshine days in December - Putnam, IL
  • Average sunshine days in December: 16.8 days

The month with the most sunshine days is November (17.7 days).
The month with the least sunshine days is May (10.7 days).

Average UV index in December
Putnam, IL

Average UV index in December - Putnam, IL
  • Average UV index in December: 2

The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is January (UV index 1).

Average cloud cover in December
Putnam, IL

Average cloud cover in December - Putnam, IL
  • Average cloud cover in December: 55

The month with the most cloud cover is January (Cloud cover 59).
The months with the least cloud cover are August and September (Cloud cover 32).

Average visibility in December
Putnam, IL

Average visibility in December - Putnam, IL
  • Average visibility in December: 6mi

The months with the highest visibility are February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, July and August (5mi).

Putnam, Illinois, USA

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